Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.08 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.88 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.77 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.060
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.48 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
6.05 s
Page Load Progression
1.6 s
3.2 s
4.8 s
6.4 s
8.0 s 9.6 s 11.1 s
12.7 sFPage Weight BudgetAction15.0 MB transferred, 204 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction9853ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://bnetstorefront.akamaized.net/static/main.7f53a645e88562e3.js | 4028ms | 3054ms | 8ms | 3rd |
| https://eu.shop.battle.net/en-us?from=root | 2906ms | 5ms | 0ms | 3rd |
| https://navbar.blizzard.com/static/v1/nav-battlenet.js | 1042ms | 560ms | 15ms | 3rd |
| Unattributable | 965ms | 65ms | 0ms | 3rd |
| https://navbar.blizzard.com/static/v1/footer.js | 249ms | 175ms | 13ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5QG6WC7 | 217ms | 180ms | 31ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js | 213ms | 124ms | 17ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-VYKNV7C0S3&cx=c>m=4e64h1 | 80ms | 60ms | 20ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-10163466&cx=c>m=4e64h1 | 79ms | 64ms | 14ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-10205746&cx=c>m=4e64h1 | 75ms | 61ms | 14ms | 3rd |
DJS BundlesAction20 scripts, 459 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://bnetstorefront.akamaized.net/static/main.7f53a645e88562e3.js | 402 KB | 107 KB (27%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5QG6WC7 | 184 KB | 79 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-VYKNV7C0S3&cx=c>m=4e64h1 | 169 KB | 66 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-10205746&cx=c>m=4e64h1 | 130 KB | 65 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-10163466&cx=c>m=4e64h1 | 130 KB | 65 KB (49%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202402.1.0/otBannerSdk.js | 105 KB | 54 KB (52%) | ✓ | 3rd |
| https://eu.shop.battle.net/static/759.9ba57cbc393515b9.js | 71 KB | 25 KB (35%) | ✓ | 3rd |
| https://eu.shop.battle.net/static/40.5fcce6c41dd7deb7.js | 58 KB | — | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/otSDKStub.js | 9 KB | — | ✓ | 3rd |
| https://bnetstorefront.akamaized.net/static/scripts.52b56af866c84fbe.js | 1 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction204 resources · 15.0 MB · 459 KB savings availableFIX
~459.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 204 resources | 15.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction44 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (508 KB)PASS
Web fonts
4
508 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
Optimization checklist
- Preload critical fonts (priority=high)
- Use woff2 format for all fonts
- Set font-display to swap, optional, or fallback
- Subset large fonts (≤100 KB each)
Fixing the unchecked items could save ~361 KB and ~722 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall204 requests over 33698msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
bnetstorefront.akamaized.net bnetstorefront.akamaized.net | Other | 4028ms | 402 KB | 27% | $23/mo | Costly |
eu.shop.battle.net eu.shop.battle.net | Other | 2906ms | 17 KB | — | $17/mo | Costly |
navbar.blizzard.com navbar.blizzard.com | Other | 1042ms | 77 KB | — | $6/mo | Costly |
Unattributable Unattributable | Other | 965ms | 0 KB | — | $6/mo | Costly |
navbar.blizzard.com navbar.blizzard.com | Other | 249ms | 77 KB | — | $1/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 217ms | 184 KB | 43% | $1/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 213ms | 105 KB | 52% | $1/mo | Essential |
Google Tag Manager www.googletagmanager.com | Tag Manager | 80ms | 169 KB | 39% | $0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 79ms | 130 KB | 49% | $0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 75ms | 130 KB | 50% | $0/mo | Optional |
These scripts may cost more than they're worth
- bnetstorefront.akamaized.net adds 4028ms and costs ~$23/month
- eu.shop.battle.net adds 2906ms and costs ~$17/month
- navbar.blizzard.com adds 1042ms and costs ~$6/month
- Unattributable adds 965ms and costs ~$6/month
- navbar.blizzard.com adds 249ms and costs ~$1/month
- Google Tag Manager adds 217ms and costs ~$1/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.
Learn more ▾ ▴
Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.
Source: web.dev
bnetstorefront.akamaized.net takes 4028ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
eu.shop.battle.net takes 2906ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
navbar.blizzard.com takes 1042ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 965ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
navbar.blizzard.com takes 249ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 217ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
52% of OneTrust's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev